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Investments (Tables)

12 Months Ended

Dec. 31, 2017

Equity Method Investments and Joint Ventures [Abstract]

Investments Reported in Other Current and Non-Current Assets

The following is a summary of our investments and the related funding commitments (in millions):

		December 31, 2017								December 31,
						Funding				2016
		Assets				Commitments				Assets
Chem-Mod LLC		$	4.0			$	—			$	4.0
Chem-Mod International LLC			2.0				—				2.0
Clean-coal investments:
Controlling interest in 6 limited liability companies that own 14 2009 Era Clean Coal Plants			10.2				—				14.3
Non-controlling interest in one limited liability companies that owns one 2011 Era Clean Coal Plant			0.6				—				0.7
Controlling interest in 17 limited liability companies that own 19 2011 Era Clean Coal Plants			58.5				—				69.0
Other investments			3.8				0.4				3.7
Total investments		$	79.1			$	0.4			$	93.7

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- References

No definition available.

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- Definition

Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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